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3 years ago

A 75-kilogram hockey player is skating across the

1 answer:

azamat3 years ago

6 0

I think it is (3) 690 N. You can use the theorem of Impulse and momentum where the impulse is equal to the change in momentum or:
$F \Delta t=m v_{f}-m v_{i}$ (where f is for final and i for initial).
So you get:
$F*0.65=0-(75*6)$
$F=692 N$

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1.A student attaches a string to a puck on a frictionless air table, and pulls with a constant force on the puck. a. Draw the fo

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for the puck :

F = force applied in the direction of pull

N = normal force on the puck in upward direction by the surface of table

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If the beam carries 1015 electrons per second and is accelerated by a 350 kV source, find the current and power in the beam.

Y_Kistochka [10]

To solve this problem we will apply the concept of current defined as the electron charge flow by the number of electrons per second. That is,

I = q*N

Here q is Flow of electric charge in one second and N the number of electron flow per second.

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P = VI

We know the charge of electron, $q = 1.602 * 10^{-19}$ Coulombs, then the current is

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3 years ago

A student throws a baseball upwards at an angle of 60 degrees to the horizontal. The initial horizontal and vertical components

frez [133]

Given data

ball throws upwards at an angle 60°

Horizontal component (Vh) = 12.5 m/s,

Vertical component (Vv) = 21.7 m/s ,

The magnitude of throw/resultant velocity (V) = ?

The resultant velocity /the velocity with which ball is throws is determined by the following equation

V = √[(Vh)² + (Vv)²]

= √[(12.5)² + (21.7)²]

= 25.04 m/s

<em> The resultant velocity or the velocity with which the ball is thrown is 25 m/s</em>

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babunello [35]

The electrons are removed from the rod and transferred to the silk cloth. This leaves the rode positively charged and the cloth negatively charged.

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